Implementation and Test of the Control Algorithms for a Diaphragm Stirling 30 K Cryocooler
Delivery to NASA of its first 30K Cryogenic Cooler based on double-acting diaphragms included a control system capable of accommodating both linear and non-linear motors oscillating at a sub-resonant frequency. The Engineering Development Model (EDM) Control System was implemented using Graphical User Interface (GUI) software and commercial data acquisition and control hardware. The unique drive waveform selected to operate each pair of compressor Linear Oscillating Motors (LOMs) and accommodate their inverse square-law transfer function is first discussed. Emphasis is then placed on the controller developed for the expanders and their Moving Magnet Motors (MMMs). The hardware implementation is described, followed by descriptions of the operational software functions and preliminary test results.
KeywordsDrive Signal Virtual Instrument Selectable Duration Preset Range Inverse Transfer Function
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- 1.Konkel, C., Gibboney, T., Van Allen, L. and Ha, K.; “Development and Demonstration of an Electronic Controller for a Double-Acting Diaphragm Cryocooler”, 7th International Cryocooler Conference, November 1992.Google Scholar